Rolling mill



June 20, 1933. c. EKSERGIAN 1,914,412

ROLLING MILL Filed Oct. 17, 1929 3 SheeLs-Sheet 1 JNI EN TOR;

I Chrolaslmis'er 12w ATTORNEY.

June 20, 1933. c. EKSERGIAN ROLLING MILL 5 Sheets-Sheet 2 FT'T Flled Opt 17, 1929 Q Q. $1M

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INVENTOR (r'olzaslElllieywlg A TTORNEY.

June 20, 1933. c. L. EKSERGIAN ROLLING MILL Filed Oct. 17, 1929 3 Sheets-Sheet 3 WTORND Patented dune 20, 1933 CARQLUS Ta. EKG, @F DETROIT, MIGHIG,

GQANY, or a e vam ASSIGNE TU BUDD EENNSYLVANIA, A GQRPQBATTQH @E PEITNSYE F BQILING MILL Application filed @ctoher 1?, 1929. Serial lilo. @0218.

The rolling mills to which the system of my invention pertains are rollin mills utilizing radially extending rolling dies, such for example, as obtuse angled rolling mills, combined spinning and rolling mills employing tables or platens as forming elements, and the like. But, without, doubt there are ap plications of my invention other than those named and that which I shall describe, in which use may be made of my invention without departing from its generic spirit.

Water cooling such diesis extremely ditficult incident jointly to the great expanse of m the die, and the huge stresses involved requiring the die to be of substantial proportions, backed up to its work with the greatest solidarity. The aim of my invention is to cool such dies eiiiciently from a standpoint of the thermodynamics of the work and the die itself, efiiciently as well from the standpoint of economically using the cooling medium, and yet provide for generous proportions of die backing and revolving head, and all due solidarity, ruggedness and sturdiness of parts and their intersecurement.

These objects I attain by utilizing in combination with the radial rolling die, cooling means behind the face thereof embodying a duct for cooling mediumwhich courses an- I, w nularly about and outwardly from the axis of the die. Coordinately I introduce fluid from the axis end of the duct and discharge it from the radially outward end. I introduce the fluid from the driving shaft of the die carrying head, and discharge it peripherally into a relatively fixed annular part.

Aiming also to reduce the cost of construction of these already expensive massive parts, I construct the duct as a radially extending series of circular canals between the die and its backing, the walls of which are constituted by the die and its backing as secured together, p

and cross connect and block off these truly a circular canals in such manner that they are connected annularly in series with each other from those axially inner to those axially outer. Thereby the formation becomes an extremely simple machining operation.

Aiming yet further, it provides special cooling for the centers of the dies in obtuse Figure l is a general longitudinal vertical sepitlion on the axes of an obtuse angled rolling m1 Figure 2 is an enlarged section of that part of the machine carrying the auxiliary fixed rolling die, and Figure 3 is an axial end elevation of a backing plate in which the annular grooves are cut and serially arranged.

The opposed obtuse angled dies of the mill are des1gnated respectively 10 and 11, the revolvmg heads upon which they are mounted 12 and 13, the driving or mounting shafts through which power is supplied to them or upon which they rotate l4 and 15, the respective bearing heads 16 and 17, the base of the machine 18, the power shaft 19 and the gear connections between the power shaft 19 and the die mounting shafts l4 and 15, respectively, 20 and 21. The various details of this gearing, the various axial and radial thrust bearings and the like do not enter into this invention and need no detailed description.

Their general arrangement is obvious from the drawings.

In order to take care of such obtuse angle as there may be (not shown here but well understood to be present in such mills) between the die mounting shafts la and 15, the ower shaft 19 is made in three sections 22, 23 and 24, the sections 22 and 24 being parallel to shafts 14 and 15, respectively, while section 23 is non-parallel and interconnects the paral. lel sections 22 and 24 through appropriate uni versal joints 25 and 26.

27 is a slip coupling between opposite and independently rotatable ends of the section 23 consisting of a suficient number of discs frictionally clamped together to permit, due to their slippage under variations of torque of the dies and 11, differential relative angular movement of these dies.

5 The primary water cooling means consists of duct 28 which courses annularly about and radially outwardly from the axis 29 of the die 10. The die 11 is not shown as provided with a water cooling system of my invention but it 19 is to be understood that it too, like the die 10, may be equipped with such a system. The walls of duct 28 are constituted by the bodies of the backing l2 and the die 10. The duct is formed by lathe turning-a multiple number of radially spaced truly circular grooves 29 in the die face of the backing 12 as shown clearly in Fig. 3, interconnecting these truly circular grooves 29 by radial grooves 30 angularly spaced apart a little distance, and blocking 2U grooves 29 angularly intermediate the radial grooves 30 by pins 31. Tn this manner a -'course for the cooling fluid approximating a spiral is provided as shown by the arrows in Fig. 3. A truly spiral path might be provided but would entail more expensive machining. The backing wall of the die 10 is faced complementally to the front wall of the backing 12 and closes the tops of all the grooves and abuts the blocking pins 31, completing the. ducts.

The inlet to the axial end 32 of the duct is by way of the axially shiftable central portion 33 of the die as clearly appears in Fig. 2. s This center is axially shiftable from the full line position to the dotted line position shown under the urge of the work being rolled and the re-acting spring34 at the left of Fig. 2; This spring confined in place by a removable plug 35 in theend of the hollow shaft 14 acts directly against a cap 36 which transmits its pressure through the intermediary of tube 37 in the hollow of shaft 14 to an opposite cap '38 threaded onto the end of an axially shiftable plunger 39 which bears the axially shiftable center 33.0f the die 10. Plunger 39 is prevented from rotating relative to the backing 12in which it is mounted by means of a "sliding spline connection 40. It. takes the force of theshiftable center 33 of the die against inter-acting shoulders 41 on the backing and plunger respectively. p v The shiftable center 33 is provided with a hollow 42 extending close to the face of the die itself. Plunger 39 is hollow and-communicates through its hollow with the hollow interior 42 of the center 33, by means of an extension nozzle 43 passing axially into the hollow 42 but spaced from the walls thereof. Radial openings 44 from the hollow 42 about the outside of nozzle 43 conduct the fluid to the first of the series of grooves 28 between the die 10 and the backing 11.

For the purpose of easy renewal the center 33 is made in two axially separate sections a having a taper fit 45 with each other as clearly appears in Fig. 2 whereby the outer may be readily removed and renewed in case of wear. Immediately surrounding the shiftable center 33, the die 10 is provided with a removable annular portion 46 providing a slide bearing for the axially shiftable center 33 and separately fabricated jointly for the purposes of mounting and securing in place the shiftable center 33, providing ease and economy of fabrication of parts, and also providing for the ready renewal of the portions of the dies adjoining the shiftable center 33. The cooling medium is introduced on the axis 29 to the hollow of the shaft 14 through the end of shaft 14 opposite-to the die 10 and by means of a pipe 47 located on the axis. This ipe is passed through a stufiing box 48 in t e plug 35 and has its inner end threaded into the cap--36 and its outer end connected with the supply conduit 48 by means of the coupling stufling box 49.

Cooling medium introduced from the supply 48 passes through pipe 47 to the interior of the operating tube 37 through which ly circular grooves 29 and thence by these {00 grooves into the reaches of the duct 28 constituted by them, annular'ly about the axis ofthe die and radially outward to be discharged through the outlet 50. So coursing in direct contact with the material of the front face of the center 33 and with the back face of the remaining portion of the die 10, the cooling medium takes the heat from the die by direct conduction and efiiciently cools it. By reason of the approximate spiral of its course, but one column of cooling fluid is utilized throughout whereby the cross section of the duct 28 may be made the maximum consistent with that mass of cooling medium necessary to carry away by direct conduction the heat necessary to be carried away, and danger of clogging which is present with irregularly coursing and irregularly sectioned columns of multiple numbers of small ducts isavoided.

The outward discharge is caught by a peripherally surrounding casing 51 spaced from the die 10 and its backing 12 and bolted fixedly to the mounting head 16. The discharge I passes freely from the casing 51 into the pit of the machine or into an appro riate rece tacle or conduit (not shown). &ntrifugall y acting flanges 52 on the head 13 throw cooling medium outwardly of the radially overlapping fixed flanges 53 of the casing and thereby prevent cooling medium from reaching the bearings of the machine.

The massiveness of the die 10 is unimpaired by the duct construction. Dowels 54 in recesses 55 between die 10 and the backing 12 intermediate the grooves 29 (see Figs. 2 and 3) transmit the huge driving torque from the backing plate to the die. Bolts 56 also in the zones intermediate the grooves 29 securely interconnect the backing 12 to the mounting head 13 of the shaft 14. The grooves 29 do not interfere with the massive and rugged construction of this backing plate. Nor is there substantial reduction of the inter-engaging face areas of die and backing plate. Nor is there complication of construction. The die 10 is ruggedly clamped to the backing plate through a pair of co-acting peripheral clamping rings 57 bolted together and about co-acting peripheral clamping flanges 58 on die and backing respectively.

All modifications and improvements falling within the generic spirit of my invention. should be protected to me so far as the prior art does not require restriction to the precise terminology employed in seeking to claim it.

What I claim as new and useful and desire to protect by Letters Patent is:

1. In combination, a radial rolling mill die, and cooling means behind the face thereof embodying a duct for cooling medium extending annularly about and outwardly from the axis of the die.

2. In combination, a radial rolling mill die, a cooling means behind the face thereof embodying a duct for cooling medium extending annularly about and outwardly from the axis of the die to its periphery, together with means for introducing fluid to the axis end of said duct.

3. In combination, a radial rolling mill die, a cooling means behind the face thereof embodying a duct for cooling medium extending annularly about and outwardly from the axis of the die, together with a hollow die supporting shaft through which fluid is introduced to the axis end of said duct.

4. In combination, a radial rolling mill die and cooling means behind the face there of embodying a duct for cooling means which courses annularly about and outwardly from the axis of the die, together with a fluid cooled central insert to the face of the die interconnected with a source of supply of cooling medium and said duct, whereby to discharge cooling medium into the radial inner end of the duct.

5. In combination, a radially rolling mill die, and cooling means behind the face thereof embodying a duct for cooling medium which courses annularly about and outwardly from the axis of the die, which duct comprises truly circular canals so cross-connected and blocked off as to throw them annularly in series with each other from the radially inner one to the radially outer one.

6. In combination, a radial rolling mill, and cooling means behind the face thereof embodying spaces through which cooling medium may course outwardly from the axis of the die, together with a fluid cooled axially reciprocable central insert to the face of the die discharging cooling fluid into the axially inner end of said space.

7. In combination, a radial rolling die, a plurality of annular channels radially spaced about the interior of said die, a plurality of radial passages interconnecting successive radially spaced annular channels and means for blocking oil said annular channels to force the cooling medium to flow annularly around said radiall spaced passages.

8. In combination, a ra ial rolling die, a backing plate upon which said die is mounted, and a plurality of channels adapted to control the passage of cooling fluid formed in one of said members adjacent its plane of contact with the other, said channels extending annularly about and outwardly from the axis of the die.

In testimonywhereof he hereunto afiixes his signature.

GAROLUS L. EKSERGIAN. 

